Richard Harrison wrote:
To keep it simple, phase difference between forward and reflected waves
is locked.

Nope, it's not, Richard, as illustrated on this web page:

http://einstein.byu.edu/~masong/HTMs...newave2EX.html

The forward phasor and reflected phasor are rotating in
opposite directions. Sometimes they are in phase (loop)
and sometimes they are 180 degrees out of phase (node).
The variable phase difference between the forward wave
and reflected wave is what causes the standing waves.
--
73, Cecil, W5DXP